Pneumatic tire.



PATENTED FEB. 28, 1905.

A. PREY.

PNEUMATIO TIRE.

APPLIOATION FILED SEPT. 12, 1904.

172M722??? JZ 72 04 2 72? F2? W Illt o, 783.858.

simian Libraries .ir aten'ted February 28, 190%.

ALFRED FltlE Y OF I ARIEE, FRANCE, ASSlG-NOR TO SOUII YFF ANONYME llllf'l lNlCUh IA'lTlQUES ()Ullt SAMSON, OF PARIS, FRANCE.

l l illliihllt'll'ltf) TlIWlEJ.

SPECIFICATION forming part of Letters Patent Nov 783,858, dated February28, 1905.

Application filed September 12, 1904 Serial No. 224,194.

To ctZZ 1071 0771 [2; may concern.-

Be it known that I, A LFRTGI) Fem, engineer, a citizen of France.residing at Paris, France, have invented certain new and usefulimprovements in IltneumaticTires, of which the following is aspecification.

The present invention has for its object a non-slipping or antiskiddingband for pneumatic tires characterized by the fact that it is'fllIIllSllGCl ii'iternally with an air-space or air-gap designed tosuppress theheating caused while traveling at high speeds by reason ofthe friction of the cover on the ground.

The greater part of the non-slipping tires at present in use are shod orfaced with pieces of iron in order to render them non-slipping, andthese systems all present the great inconvenience that they becomeheated by reason of the friction of the iron pieces or studsupon theground. This heating. which may become very considerable at high speeds,is transmitted by the iron studs to the interior of the tire and sets upbursting of the air tubes or chambers by reason of the excessiveexpansion of the air compressed therein.

The non-slipping or non-skidd ing tires made according to this inventionobviate this inconvenience,and consequently give very great secnrity.

Clhe annexed drawing is a perspective view, partly in transversesection.

it represents the body of an ordinary pneumatic tire of commerce.

6 represents a leather n'otect.ing-cover faced with a wearing band ortrend 0. '.l.hisl.)a1nlis 'llexible and is 'lurl'iished with steel studsor rivets (I, which also extend through the cover 0. Uertainarrai'igements of this kind are at present known; but in all of them thecover I) is solutioned (or fastened in any other suitable manner) allover the ekteriorof the the (6. Now according to the present inventionthe cover 0 is only lixed or solutioncd to the tire by its externaledges-for example, at the parts from r tof and to lt SO that the partwhich has the largest diameter thatis to say, the part from c to r isnot fastened or solutioned on. This latter part of the cover is thuskept absolutely free or lioatii'ig, as it were so that there exls sbetween it and the part (b an empty space, which may have a depth ofsome few millimeters. in this manner there is thus constantly a cushionof air interposr-sd between the exterior of the tire a and the innerpart of the cover I). This cushioirisolates the line of rivets or studs(Z from the tire (a and thus prevents or hinders the transmission of theheat to the interior of the tire. As the studded portion of the cover iskept separate or floating, it consequently results that at anyparticular portion of the tire a the lines of rivets do not always comeexactly on the same spot every time that the portion in question touchesthe ground. 'lllhis fact tends to increase the dilliciillty of thetransmission of the heat to the interior.

If it be desired to still further insure the isolation by causing therenewal or change ol. the air contained in the empty space 'i, this maybe done by piercing at intervals suitable vent-holes Ill, which put theintermediate cushion ol air into communication with the atmosphere. Thediameter of these ventholes should be large enough to allow the air topass and yet small enough to prevent the entry of gravel or grit.Moreover, the pressure which is set up in the space /i by thedeformation of the tire, due to the rolling or traveling, issuflicientto keep the vent-holes fi constantly open and clear. theportion a against the action of the row of studs or rivets (I anintermediate strip of leather solutioned onto the said portion may beinterposed, as shown at 2/1., the edges of this leather band beinggradually tapered or beveled oil in order not to cover the adjacentcanvas.

l claim-- 1. in a pneumatic tire, a protecting-cover secured thereto soas to leave an air-space between the sameand the said tire,a flexibleband forming a tread carried by the said cover. said band and coverprovided with openings conmiunicating with the air-space. and metalreinforcements on the said band.

2. in a pneumati c tire having a spaced cover Finally, to protectforming an annular air-chamber therebetire, and a plurality ofprojections on said tween, and a flexible band reinforcing the band.tread of the cover, said cover provided with In testimony whereof I havehereunto set openings in communication with the air-charnmy hand inpresence of two subscribing wit- 5 ber, and means carried by the saidband for nesses.

reinforcing the same. ALFRED FREY 3. Ina pneumatic tire, a perforatedprotecting-cover, of a band secured thereto forming a thickened tread,said cover arranged to leave IO an air-chamber between the same and thesaid Witnesses:

H ANSON (J. (JOKE, LEVI ZANFFRET.

